// Copyright (C) 2014 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package com.googlesource.gerrit.plugins.serviceuser;

import com.google.gerrit.server.account.AccountCache;
import com.google.gerrit.server.account.AccountState;
import com.google.gerrit.server.events.CommitReceivedEvent;
import com.google.gerrit.server.git.validators.CommitValidationException;
import com.google.gerrit.server.git.validators.CommitValidationListener;
import com.google.gerrit.server.git.validators.CommitValidationMessage;
import com.google.gwtorm.server.OrmException;
import com.google.inject.Inject;
import com.google.inject.Singleton;

import com.googlesource.gerrit.plugins.serviceuser.GetServiceUser.ServiceUserInfo;

import org.eclipse.jgit.lib.PersonIdent;

import java.util.Collections;
import java.util.List;

@Singleton
class ValidateServiceUserCommits implements CommitValidationListener {
  private final ServiceUserResolver serviceUserResolver;
  private final AccountCache accountCache;

  @Inject
  ValidateServiceUserCommits(ServiceUserResolver serviceUserResolver,
      AccountCache accountCache) {
    this.serviceUserResolver = serviceUserResolver;
    this.accountCache = accountCache;
  }

  @Override
  public List<CommitValidationMessage> onCommitReceived(
      CommitReceivedEvent receiveEvent) throws CommitValidationException {
    try {
      PersonIdent committer = receiveEvent.commit.getCommitterIdent();
      ServiceUserInfo serviceUser =
          serviceUserResolver.getAsServiceUser(committer);
      if (serviceUser != null) {
        if (serviceUser.owner != null
            && serviceUserResolver.listActiveOwners(serviceUser).isEmpty()) {
          throw new CommitValidationException(String.format(
              "Commit %s of service user %s (%s) is rejected because "
              + "all service user owner accounts are inactive.",
              receiveEvent.commit.getId().getName(), committer.getName(),
              committer.getEmailAddress()));
        } else {
          AccountState creator = accountCache.get(serviceUser.createdBy._id);
          if (creator == null || !creator.getAccount().isActive()) {
            throw new CommitValidationException(String.format(
                "Commit %s of service user %s (%s) is rejected because "
                + "the account of the service creator is inactive.",
                receiveEvent.commit.getId().getName(), committer.getName(),
                committer.getEmailAddress()));
          }
        }
      }
    } catch (OrmException e) {
      throw new CommitValidationException(
          "Internal error while checking for service user commits.", e);
    }
    return Collections.emptyList();
  }
}